The best thing to do is take a look at Khaine Star's guide index in the Guides section of the forum, there are several links to Stone Armour guides there.
The reason someone might say you don't need these armours is because they are outclassed by Granite which you can take at 32. A lot of stone tanks take the armours you get before level 32 (except maybe Brimstone) and then do a respec at 32 where they may decide to drop a few of the earlier ones.
I would definitely take Rock and Crystal when they become available. The thing about Brimstone is you don't always come up against fire damage and hardly any cold - at least before level 32, so it's one you might skip.
Minerals gives you Defence against Psi damage and also resistance to Confuse and a +Perception bonus which helps you see Stealthed enemies.
Very true, Filth - you're not gonna need the other armours when you have 'slotted' GA. 
They'll be useless: only things that go with GA are rooted, earth's embrace, stone skin and mud pots. 
[ QUOTE ]
Very true, Filth - you're not gonna need the other armours when you have 'slotted' GA.
They'll be useless: only things that go with GA are rooted, earth's embrace, stone skin and mud pots.
[/ QUOTE ]
hmm, except I don't agree with this 
- you have to remember anytime you're exemped below level 32 you lose Granite, so this could be for a TF or Trial you want to do or for Bloody Bay or Siren's Call. For this you might want to keep Rock Armour, Minerals (which will help you see Stalkers and other Stealthed mobs) and maybe even Crystal. Even after level 32 you might want to keep these armours (especially Minerals).
It's also true that because of the Healing abilities of Stone (Rooted and EE) you might be able to do a lot without GA or anything else except Rooted + Pots, I've been able to do this partly because I have Fault in Stone Melee which is a great AoE stun power, Ice secondary is even better.
i personaqlly dont have any powers than cannot be used with granite armor, really, ALL i mean ALL me powers can be used in granite cos i do alot of mobs, but if u r a solo dude i would go half half, depends on how u wnana play
@Flange
Defiants one and only flange
232 badges
Lui - lvl 50 energy/energy blaster
AuroraPB - lvl 50...PB
Amoeba - lvl 35 Granite/Fire
Zombie Russel - lvl 30 Katana/Invul
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Salizar - Fire/Rad ( in the making )
The other armours are definitely usefull. I'll often exemp down to below level 20. Plus I love having brimstone and being able to do the Infernal mission without using GA.
Very much depends how you wanna play,nope post 32 the other armours are not essential.
But they are handy.Also allows you a bit of variation to your game play.
After i got granite i had a great 3-4 lvl feeling invinceble then the game got rather boring by which time i had respected out said armours only to put them back in on lvl 44 respec
I'm actually on my second stone tank at mo,lvl31
for which i wont be gettin granite,in most situation at the moment earths embrace does a superb regen rate to get me out of trouble.
Lots of peeps r saying u don't need Brimstone A., Crystal Armour and i think one more Armour (i'm talking about Rock Armour for Tanks). Is it true u don't need it???